
It wasn't as if the son of Fastnet Rock was firing blanks, after all he'd won the Group III Bill Ritchie Stakes and finished sixth in the Group I Epson Handicap, but his champion trainer was convinced he hadn't got to the bottom of Criterion's half-brother so it was time for action.
"He's been gelded since we last saw him," Waller told Racenet.
"He's always been a very straight forward horse to train but I think he was holding a little bit back.
"In saying that he's Group I-placed but we felt to get that bit more out of him we had to try something so he was gelded.
"He's shown us he's capable of winning a Group I at home."
Comin' Through is set to resume in Saturday's Randwick feature, the Group II Apollo Stakes (1400m).
The Randwick 1400m circuit is arguably Comin' Through's favourite with two wins and a second coming from three previous starts and he's prepared for his return with two solid trials over 900 and 1000m.
"He's going well and I expect him to run well on Saturday," Waller said. "I just think he's capable of improving again so this prep will tell us.
"Where do we head towards? Do we head towards a Doncaster? Do we head towards something further perhaps? Something like a Ranvet.
"He's eligible for handicap races so we're coming into this with an open mind."
Retained to race by his breeder Sir Owen Glenn, Comin' Through has already won nearly $500,000 in prizemoney, but his best may still be to come.
Peter and Paul Snowden train the two year-old full brother to Comin' Through called Sir Owen and his dam Mica's Pride produced a filly by Sebring last spring that is a full sister to $7million earner Criterion.